SSC Scientific Assistant - Strength of Materials 1000+ MCQ [Solved] PDF Download
Thursday 9th of March 2023
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1. The compression ratio is the ratio of
A. Swept volume to total volume
B. Total volume to swept volume
C. Swept volume to clearance volume
D. Total volume to clearance volume
Answer : D
A. Swept volume to total volume
B. Total volume to swept volume
C. Swept volume to clearance volume
D. Total volume to clearance volume
Answer : D
2. The gas turbine cycle with regenerator improves
A. Thermal efficiency
B. Work ratio
C. Avoids pollution
D. None of these
Answer : A
A. Thermal efficiency
B. Work ratio
C. Avoids pollution
D. None of these
Answer : A
3. The columns whose slenderness ratio is less than 80, are known as
A. Short columns
B. Long columns
C. Weak columns
D. Medium columns
Answer : A
A. Short columns
B. Long columns
C. Weak columns
D. Medium columns
Answer : A
4. The extension of a circular bar tapering uniformly from diameter d? at one end to diameter d? at the other end and subjected to an axial pull of P is given by
A. ?l = 4PE/ ?l²
B. ?l = 4?ld²/PE
C. ?l = 4Pl/?Ed?d?
D. ?l = 4PlE/ ?d?d?
Answer : C
A. ?l = 4PE/ ?l²
B. ?l = 4?ld²/PE
C. ?l = 4Pl/?Ed?d?
D. ?l = 4PlE/ ?d?d?
Answer : C
5. An isothermal process is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : A
6. Those substances which have so far not been resolved by any means into other substances of simpler form are called
A. Elements
B. Compounds
C. Atoms
D. Molecules
Answer : A
A. Elements
B. Compounds
C. Atoms
D. Molecules
Answer : A
7. Charles' law states that all perfect gases change in volume by __________ of its original volume at 0°C for every 1°C change in temperature, when pressure remains constant.
A. 1/27th
B. 1/93th
C. 1/173th
D. 1/273th
Answer : D
A. 1/27th
B. 1/93th
C. 1/173th
D. 1/273th
Answer : D
8. In the tensile test, the phenomenon of slow extension of the material, i. e. stress increasing with the time at a constant load is called
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
Answer : A
A. Creeping
B. Yielding
C. Breaking
D. Plasticity
Answer : A
9. The pull required to crush the rivet per pitch length is
A. p.t.?t
B. d.t.?c
C. ?/4 × d² × ?t
D. ?/4 × d² × ?c
Answer : B
A. p.t.?t
B. d.t.?c
C. ?/4 × d² × ?t
D. ?/4 × d² × ?c
Answer : B
10. In a prismatic member made of two materials so joined that they deform equally under axial stress, the unit stresses in two materials are
A. Equal
B. Proportional to their respective moduli of elasticity
C. Inversely proportional to their moduli of elasticity
D. Average of the sum of moduli of elasticity
Answer : B
A. Equal
B. Proportional to their respective moduli of elasticity
C. Inversely proportional to their moduli of elasticity
D. Average of the sum of moduli of elasticity
Answer : B
11. The kinetic energy per kg molecule of any gas at absolute temperature T is equal to (where Ru = Universal gas constant)
A. Ru × T
B. 1.5 Ru × T
C. 2 Ru × T
D. 3 Ru × T
Answer : B
A. Ru × T
B. 1.5 Ru × T
C. 2 Ru × T
D. 3 Ru × T
Answer : B
12. In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
A. More
B. Less
C. Same
D. More/less depending on composition
Answer : B
A. More
B. Less
C. Same
D. More/less depending on composition
Answer : B
13. The efficiency of Joule cycle is
A. Greater than Carnot cycle
B. Less than Carnot cycle
C. Equal to Carnot cycle
D. None of these
Answer : B
A. Greater than Carnot cycle
B. Less than Carnot cycle
C. Equal to Carnot cycle
D. None of these
Answer : B
14. In compression test, the fracture in cast iron specimen would occur along
A. The axis of load
B. An oblique plane
C. At right angles to the axis of specimen
D. Would not occur
Answer : B
A. The axis of load
B. An oblique plane
C. At right angles to the axis of specimen
D. Would not occur
Answer : B
15. A material obeys hooks law up to
A. Plastic limit
B. Elastic limit
C. Yield point
D. Limit of proportionality
Answer : B
A. Plastic limit
B. Elastic limit
C. Yield point
D. Limit of proportionality
Answer : B
16. The layer at the centre of gravity of the beam as shown in the below figure, will be
A. In tension
B. In compression
C. Neither in tension nor in compression
D. None of these
Answer : C
A. In tension
B. In compression
C. Neither in tension nor in compression
D. None of these
Answer : C
17. Which is the false statement about true stress strain method?
A. It does not exist
B. It is more sensitive to changes in both metallurgical and mechanical conditions
C. It gives a more accurate picture of the ductility
D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.
Answer : A
A. It does not exist
B. It is more sensitive to changes in both metallurgical and mechanical conditions
C. It gives a more accurate picture of the ductility
D. It can be correlated with stress strain values in other tests like torsion, impact, combined stress tests etc.
Answer : A
18. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : B
A. Increase
B. Decrease
C. Remain unchanged
D. Increase/decrease depending on application
Answer : B
19. When it is indicated that a member is elastic, it means that when force is applied, it will
A. Not deform
B. Be safest
C. Stretch
D. Not stretch
Answer : C
A. Not deform
B. Be safest
C. Stretch
D. Not stretch
Answer : C
20. The strain energy stored in a body due to suddenly applied load compared to when it is applied gradually is
A. Same
B. Twice
C. Four times
D. Eight times
Answer : C
A. Same
B. Twice
C. Four times
D. Eight times
Answer : C
21. If the radius of wire stretched by a load is doubled, then its Youngs modulus will be
A. Doubled
B. Halved
C. Becomes four times
D. None of the above
Answer : D
A. Doubled
B. Halved
C. Becomes four times
D. None of the above
Answer : D
22. Petrol is distilled at
A. 65° to 220°C
B. 220° to 345°C
C. 345° to 470°C
D. 470° to 550°C
Answer : A
A. 65° to 220°C
B. 220° to 345°C
C. 345° to 470°C
D. 470° to 550°C
Answer : A
23. The __________ is obtained when carbonisation of coal is carried out at 500° to 700° C.
A. Soft coal
B. Hard coal
C. Pulverised coal
D. Bituminous coal
Answer : A
A. Soft coal
B. Hard coal
C. Pulverised coal
D. Bituminous coal
Answer : A
24. Which of the following is the correct statement?
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
Answer : C
A. All the reversible engines have the same efficiency.
B. All the reversible and irreversible engines have the same efficiency.
C. Irreversible engines have maximum efficiency.
D. All engines are designed as reversible in order to obtain maximum efficiency.
Answer : C
25. The efficiency of Carnot cycle depends upon
A. Temperature limits
B. Pressure ratio
C. Volume compression ratio
D. Cut-off ratio and compression ratio
Answer : A
A. Temperature limits
B. Pressure ratio
C. Volume compression ratio
D. Cut-off ratio and compression ratio
Answer : A
26. First law of thermodynamics deals with
A. Conservation of heat
B. Conservation of momentum
C. Conservation of mass
D. Conservation of energy
Answer : D
A. Conservation of heat
B. Conservation of momentum
C. Conservation of mass
D. Conservation of energy
Answer : D
27. A cycle consisting of two constant pressure and two isentropic processes is known as
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. None of these
Answer : D
A. Carnot cycle
B. Stirling cycle
C. Otto cycle
D. None of these
Answer : D
28. The state of a substance whose evaporation from its liquid state is complete, is known as
A. Vapour
B. Perfect gas
C. Air
D. Steam
Answer : B
A. Vapour
B. Perfect gas
C. Air
D. Steam
Answer : B
29. The rivets are used for __________ fastenings.
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A
A. Permanent
B. Temporary
C. Semi-permanent
D. None of these
Answer : A
30. A cycle consisting of two adiabatic and two constant pressure processes is known as
A. Otto cycle
B. Ericsson cycle
C. Joule cycle
D. Stirling cycle
Answer : C
A. Otto cycle
B. Ericsson cycle
C. Joule cycle
D. Stirling cycle
Answer : C
31. According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
A. First kind
B. Second kind
C. Third kind
D. None of these
Answer : B
A. First kind
B. Second kind
C. Third kind
D. None of these
Answer : B
32. Resilience is the
A. Energy stored in a body when strained within elastic limits
B. Energy stored in a body when strained up to the breaking of the specimen maximum strain
C. Energy which can be stored in a body
D. None of the above
Answer : D
A. Energy stored in a body when strained within elastic limits
B. Energy stored in a body when strained up to the breaking of the specimen maximum strain
C. Energy which can be stored in a body
D. None of the above
Answer : D
33. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C
A. Cracking
B. Carbonisation
C. Fractional distillation
D. Full distillation
Answer : C
34. Select the correct statement as per Charles' law
A. p.v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant
Answer : B
A. p.v = constant, if T is kept constant
B. v/T = constant, if p is kept constant
C. p/T = constant, if v is kept constant
D. T/p = constant, if v is kept constant
Answer : B
35. Modulus of rigidity is defined as the ratio of
A. Longitudinal stress to longitudinal strain
B. Volumetric stress to volumetric strain
C. Lateral stress to Lateral strain
D. Shear stress to shear strain
Answer : D
A. Longitudinal stress to longitudinal strain
B. Volumetric stress to volumetric strain
C. Lateral stress to Lateral strain
D. Shear stress to shear strain
Answer : D
36. The buckling load for a given material depends on
A. Slenderness ratio and area of cross-section
B. Poisson's ratio and modulus of elasticity
C. Slenderness ratio and modulus of elasticity
D. Slenderness ratio, area of cross-section and modulus of elasticity
Answer : D
A. Slenderness ratio and area of cross-section
B. Poisson's ratio and modulus of elasticity
C. Slenderness ratio and modulus of elasticity
D. Slenderness ratio, area of cross-section and modulus of elasticity
Answer : D
37. Which of the following is the correct statement?
A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
D. The efficiency of Otto or Diesel cycle has nothing to do with compression ratio.
Answer : B
A. For a given compression ratio, both Otto and Diesel cycles have the same efficiency.
B. For a given compression ratio, Otto cycle is more efficient than Diesel cycle.
C. For a given compression ratio, Diesel cycle is more efficient than Otto cycle.
D. The efficiency of Otto or Diesel cycle has nothing to do with compression ratio.
Answer : B
38. The bending equation is
A. M/I = ?/y = E/R
B. T/J = ?/R = C?/l
C. M/R = T/J = C?/l
D. T/l= ?/J = R/C?
Answer : A
A. M/I = ?/y = E/R
B. T/J = ?/R = C?/l
C. M/R = T/J = C?/l
D. T/l= ?/J = R/C?
Answer : A
39. In a steady flow process, the ratio of
A. Heat transfer is constant
B. Work transfer is constant
C. Mass flow at inlet and outlet is same
D. All of these
Answer : D
A. Heat transfer is constant
B. Work transfer is constant
C. Mass flow at inlet and outlet is same
D. All of these
Answer : D
40. When shear force at a point is zero, then bending moment is _________ at that point.
A. Zero
B. Minimum
C. Maximum
D. Infinity
Answer : C
A. Zero
B. Minimum
C. Maximum
D. Infinity
Answer : C
41. The intensity of stress which causes unit strain is called
A. Unit mass
B. Modulus of rigidity
C. Bulk modulus
D. Modulus of Elasticity
Answer : D
A. Unit mass
B. Modulus of rigidity
C. Bulk modulus
D. Modulus of Elasticity
Answer : D
42. The heating of a gas at constant pressure is governed by
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : B
A. Boyle's law
B. Charles' law
C. Gay-Lussac law
D. Avogadro's law
Answer : B
43. Shear stress induced in a shaft subjected to tension will be
A. Maximum at periphery and zero at center
B. Maximum at center
C. Uniform throughout
D. None of the above
Answer : D
A. Maximum at periphery and zero at center
B. Maximum at center
C. Uniform throughout
D. None of the above
Answer : D
44. A double strap butt joint with equal straps is
A. Always in single shear
B. Always in double shear
C. Either in single shear or double shear
D. None of these
Answer : B
A. Always in single shear
B. Always in double shear
C. Either in single shear or double shear
D. None of these
Answer : B
45. The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.
A. Boyle's law
B. Charle's law
C. Gay-Lussac law
D. Joule's law
Answer : D
A. Boyle's law
B. Charle's law
C. Gay-Lussac law
D. Joule's law
Answer : D
46. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kelvin Planck's law
Answer : A
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kelvin Planck's law
Answer : A
47. The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.
A. 1 g
B. 10 g
C. 100 g
D. 1000 g
Answer : D
A. 1 g
B. 10 g
C. 100 g
D. 1000 g
Answer : D
48. The efficiency of Diesel cycle depends upon
A. Temperature limits
B. Pressure ratio
C. Compression ratio
D. Cut-off ratio and compression ratio
Answer : D
A. Temperature limits
B. Pressure ratio
C. Compression ratio
D. Cut-off ratio and compression ratio
Answer : D
49. In an irreversible process, there is a
A. Loss of heat
B. No loss of heat
C. Gain of heat
D. No gain of heat
Answer : A
A. Loss of heat
B. No loss of heat
C. Gain of heat
D. No gain of heat
Answer : A
50. The safe twisting moment for a compound shaft is equal to the
A. Maximum calculated value
B. Minimum calculated value
C. Mean value
D. Extreme value
Answer : B
A. Maximum calculated value
B. Minimum calculated value
C. Mean value
D. Extreme value
Answer : B
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